Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu sach » tu sach, thuat sach, thuoc sach
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang doc) OR (nang luc)) hoi. hieu ve pham thuc day hanh ((di cua) or (de cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang doc) OR (nang luc)) hoi. hieu ve pham thuc day hanh ((di cua) OR (de cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang doc) OR (nang luc)) hoi. hieu ve pham thuc day hanh ((di cua) or (de cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang doc) OR (nang luc)) hoi. hieu ve pham thuc day hanh ((di cua) or (de cua)) te*.